Read PKCS#1 private key format in java

Question

I want to sign data with RSA private key in java. Private key follows PKCS#1 format and unfortunately, I found no method or jar file in order to read private key and sign data in java. Note that there are bunch of the same questions and all found to change the private key format from PKCS#1 to PKCS#8 as a comprehensive solution. This means changing the private key totally and changing final signed data. Is there any promising answer for this problem? Thanks a million.

Here is the data that I wanna sign it with the private key

1A2B3C8D9JCDFGHJKLDMNFDH1A2B3C8D9JCDFGHJKLDMNFDH52018-05-20T12:52:50.553+04:30parsian-bank.ir

Here is the private key

Here is the expected result:

HzO+QqTuy6IVYVtEsoHPw8ZXFiSj/Vtw9nFJEDzYP+UYPTiv270Vv3QBuh2dujdTE+5bbDvocroK9aK5Tl0fhTvNnKIntGExDETnUU6t3IvUDkhyQWsPN5nokdELa0mhY/ZVPZwXLbSBE8BoX3UG71OWUvZ+/B6lxSJBCwij28+PI4fiPWwHPiWDgsSEts1g13NtRgPkHDf57Q20OF6y5t+bdwC38DFoj0yuwmkfHxoNl4JwWO01pPWpaMnmW0r+AISysY+ZbmC64tGlu7PKCmWxixkxeaSyUNiA+A8R5xoE9ly3Atep0SfpAVOb5grITHH43ITXo0kRCOcr+m+Eig==

And the result that obtain form changing PKCS#1 to PKCS#8:

Z49gXHUPlhiNaQgZD9X1ITLo4RgRUs9iJsk486H2jepCcHGR20GcbIKciANqDRuWHc4Q8bZTqLWXvXm3pCfov2KjNdR73TskdtWkdLUdOK4lpN5gc5GLEZreQq4CzXIJqTvE1KAViEHHYj3FJz7DViuTJ8P93urK95YfZOiyEwy9aCD93i8WgPq8Uypkx7tH31JOAj4Tk3E2NfE5Jbw6Awb/5v3sCScmdnr5P7UxCIQjeB20LzpQsQpWsTVACbj5UOensj+tRH3oxDbDfweTOtqRIeNpTJGFnDE4rdPBBtCZZ5Nv5xmKTg0ZZAiUGAUaCuUSDjihjTMXUXDmosrznA==

Do you try Bouncycastle? -- https://stackoverflow.com/questions/41934846/read-rsa-private-key-of-format-pkcs1-in-java — Kirill Liubun, May 22 '18 at 11:31
Changing the private key format (between any of PKCS1 PKCS8 PKCS11 XML or anything else you can find) doesn't change the resulting signature or signed data in the least. Is your PKCS1 in PEM or DER or something else, and if PEM (or maybe something else) is it encrypted? — dave_thompson_085, May 22 '18 at 20:09
PKCS#1 is in RSA format. I changed it to PKCS#8 but unfortunately signed data was completely different from what I expected. — Seyyed Hossein SeyyedAghaei Re, May 23 '18 at 05:57
Changing the key format should have no effect and never does for me (and I do it all the time). Your first signature is the correct RSASSA-PKCS1v1_5-SHA256 signature for that data; your second signature is also a valid signature but for different data. [Please show the code that does the second signature](https://stackoverflow.com/help/mcve) — dave_thompson_085, May 25 '18 at 20:52
(1) Don't post code in comments; it's unreadable. (2) Don't post your question in comments; it's against Stack policy. Edit your question to contain your question; comments often are deleted. (3) Follow my link to the help center where it explains what Minimal Complete and Verifiable means. (4) On rechecking I apparently swapped the data; it is your _second_ signature (the one you call wrong) that is correct, so it's the code for the _first_ signature (using PKCS1) we need to verify. — dave_thompson_085, May 28 '18 at 21:20

Read PKCS#1 private key format in java

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